[PATCH 4.9 44/83] ext4: reject inodes with negative size

[Greg Kroah-Hartman]

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Darrick J. Wong <darrick.w...@oracle.com>

commit 7e6e1ef48fc02f3ac5d0edecbb0c6087cd758d58 upstream.

Don't load an inode with a negative size; this causes integer overflow
problems in the VFS.

[ Added EXT4_ERROR_INODE() to mark file system as corrupted. -TYT]

Fixes: a48380f769df (ext4: rename i_dir_acl to i_size_high)
Signed-off-by: Darrick J. Wong <darrick.w...@oracle.com>
Signed-off-by: Theodore Ts'o <ty...@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 fs/ext4/inode.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4434,6 +4434,7 @@ struct inode *ext4_iget(struct super_blo
        struct inode *inode;
        journal_t *journal = EXT4_SB(sb)->s_journal;
        long ret;
+       loff_t size;
        int block;
        uid_t i_uid;
        gid_t i_gid;
@@ -4534,6 +4535,11 @@ struct inode *ext4_iget(struct super_blo
                ei->i_file_acl |=
                        ((__u64)le16_to_cpu(raw_inode->i_file_acl_high)) << 32;
        inode->i_size = ext4_isize(raw_inode);
+       if ((size = i_size_read(inode)) < 0) {
+               EXT4_ERROR_INODE(inode, "bad i_size value: %lld", size);
+               ret = -EFSCORRUPTED;
+               goto bad_inode;
+       }
        ei->i_disksize = inode->i_size;
 #ifdef CONFIG_QUOTA
        ei->i_reserved_quota = 0;